Heat interchanger



late'nted lidar. 3l, i925.

UNTED STATES ersten.;

NORRIS H. :FROST2 OF WEST HOBOKEN, NEW JERSEY.

' HEAT NTERCHANGIER.

Applieation led April 23,

,lnterchangers, of which the following a specification.

This invention is a counter current heat interchanger particularly adapted for heating a moving,T body ot liquid on its way to a delivery point, suoli as a body ot' liquid passing from supplyr tank or storage tank to a portable tank. One object of the invention is to provide heating apparatus which will rapidly heat the liquid as needed .during` its passage to a delivery outlet, and thereby (deviate the necessity of continuously maintaining a large body ot' liquid at connect upper and lower headers.

'screws in peripheral flanges.

a high temperature.

As one important feature ot my improved apparatus l employtwo separate and coniplete units, each including headers and connecting pipes, and these are so designed and proportioned that none is entirely enclosed Within-the other. Thus there is up escape for the heat from the inner unit" except to the` fluid in the outer unit, andsaid fluid is caused to flow in'a comparatively thin film between the units. As a further feature the two units are so designed that the inner unit is supported'.v by its inlet and outlet pipes which are so mounted as to permit ot' expansion and contraction of the parts.

In the accompanying drawings:

Fig. l is a vertical section through au apparatus embodying my invention, and

Figs. 2 and 3 are vertical sections on the lines 2-2 and 33 respectively of Fig.' l.

In the forni illustrated, the outer unit includes a plurality of parallel pipes l0 which To facilitate assembly each header includes a wall or tube sheet 'il into which the ends of the pipes are expanded, rolled or otherwise, secured, and a body or main pait l2 which may be substantially semi-cylindrical in cross-section. The tube sheet and the body part are detach-ably secured together in any suitable manner, as for instance by bolts or The inner header is substantially the saine in desif'rn, although it ditl'ers in proportions.

The inner pipes 'i3 are disposed within the outer pipes, and are longer than the lattei,I but ot' smaller diameter, so as to leave 192e. senat no. 'masas'.

thin annular passages therebetween. The inner headers. are also formed each of two parts, nana .y a tube sheet 14- shorter and narrower than the. tube sheets 11 and spaced a short distance therefrom, and a main or body part 15 approximately se1nicylindrical and shorter and smaller than the Vparts 12 of the outer headers. These parts 14 and l5 are detaehably secured together, as for instance. by screws or bolts. "lhus the inner unit' may be. completely enclosed in the outer unit and a thin space for liquid to be heated willbe provided around not only the inner tubes but also around the inner headers.

For supporting the inne-r unit land also for conducting the heating medium thereto, the upper inner header is provided with a pair oi pipes 16 and 17 in alignment with each other and secured in threaded openings in the opposite end .walls thereof. These project through stuffing boxes 2() in the end Walls of 'the upper outer header and permit or" endivise expansion of thel inner header. The pipes thus serye as hangers and one pipe, for instai'ice'v the pipe 16, may

er ed to the steam supply. while the other, 17, may be capped or replaced with a supporting rod of the saine size: lhe lower innerheader is provided with an out` let or drain pipe it? which preferably leads from the lower side, thereof and extends at right angles to the pipes 16 and IT and through a stuling box 20. .llndwiee exp-.ur

'Sion or contraction of the .inner pipes 133 is permitted by .the sliding olf the pipe 19 through its stuffing box. The lower inner header may expand cndwisc in each direction trom this single drain pipe. Fluid'to be heated may be. conducted to and trein the outer unit in any suitable manner, and preferably iioivs in the opposite direction to thatof the heating medium. is sho-.vn the lower outer header has a suppl)v pipe 2l4 entering the bottoni wall and the upper out` er header'has :rn outlet ipe L leading,r from the top wall. it' will lie evident that tull 1 l E advantage is unten ol the heat troni the steam since l .1h the headers and the steam tubes are entirely surrouxulcd by the liquid to be hea: d, lt desired` the path of the liquid to he hrated may be leug'lheued und heat transference pronmed by the use of spiral ball' hates 22?, arranged in the space i the pipes l?) and the pipes l0. nalile plates are preferably weldcdpr otherwise secured to the inner tubes'so that may Vary in diiierent installations, but it is desirable that the cross-sectional area of the annular lspaces between the pipes be substantially equal to the cross-sectional area of the inlet and outlet pipes 21 and 22.

I have mentioned headers as upper and lower, but it Will be quite obvious that the device need not necessarily be arranged in vertical position in order to be effective, and means other than steam pipes 1Gr and 17 might be utilized for properly supporting the heater unit in spaced relationship'to the Walls of the outer unit. It Will'be evident that rapid and etlicient heat transference is obtained by passing the liquid in'thin films l round the. steam headers and steam pipes. .lhere being no connection of the inner and outer headers except the pipes 16. 17` and 19, differential expansion and contraction of thel innerV and outer members may occur Without damage to either member.

Having thus described my invention, what I claim as new and desireto secure by Letters Patent is:

l. A- heat interchanger including an innelI unit and an outer unit, each including a series of parallel pipes and a pair of headers, each header including a tube sheet and a semi-cylindrical body part, the pipes of the inner unit lbeing smallerand longer than the pipes of the outer unit and disposed therein, and the headers of the inner unit being disposed within the headers of the outer unit and spaced from the Walls thereof, a pair ot hangers secured to the ends ot one inner header and extending through the ends of the corresponding outer header and one hangerl serving as a fluid supply pipe, an outlet pipe' at right angles to the hangers and extending from the other inner header through the Wall of its corresponding outer header. and stutling boxes on i the outer headers and through which said hangers and outlet pipe extend.

2. A heat interchanger including an inner unlt and an outer unit, each including a series of parallel pipes and a pair of headers, the pipes of .the inner unit being smaller and longer than the pipes of the outer` unit and disposed therein, and the headers of the inner unit being disposed within the headers of the outer unit and spaced from the Walls thereof, and a pair of hangers secured to the ends of one inner header and extending through the ends of the corresponding outer header, and one hanger serving as a. fluid supply pipe, an outlet pipe extending from the other inner header through the Wall of its corresponding outer header, and stuffing boxes o-n the outer headers and through which said hangers and outlet pipe extend.

3. A heat interch-anger including an inner unit and Van outer unit, each including a series of parallel .pipes and a pair of headers, the pipes of the inner unit being nsmaller and longer than the pipes ot' the outer unit and disposed therein, and the headers of the inner unit being disposed Within the headers of 'the outer unit and spaced from the Walls thereof, means for supportingone inner h ader Within its corresponding outerheader ai d il. permitting longitudinal expansion thereof, and a conduit from the other inner header through the Wall. of its correspond ing outer header and disposed at right angles to said headers. l

4. A heat interchanger including an inner unit and an outer unit,`eaeh including a series of parallel pipes and a pair of headers, the pipes of the inner unit being smaller and longer than the pipes of the outerunit and disposed therein, and theheaders of the inner unit being disposedv Within the headers oi the outer unit''a'nd spaced from the Walls thereof, a condi" l,extending from one inner header thron'k` the yenclgiila'll of its corresponding outer" header, aconduit extending from the other inner i header through the side wall of the other outer header, and in a direction at. right angles to the first mentioned conduit, and stuliing boxes on the outer headers and throughwhich said conduits extend.

Signed at Union Hill in the county of Hudson and State of New Jersey this 21 day of April A.. D. 1924.. i

Noni-ns H. raosn` 

